1. A multi-stage latch assembly for facilitating removal of a structural element from a chassis, comprising:
a lock configured to toggle between a locked state and an unlocked state;
a latch configured to translate between a first position and a second position such that the latch is in the first position when the lock is in the locked state and the latch is in the second position when the lock is in the unlocked state; and
an indicator other than the lock itself or a portion thereof and other than the latch itself or a portion thereof configured to provide a user-visible indication that the lock is in the unlocked state.
2. The multi-stage latch assembly of claim 1, wherein the latch is configured to translate from the second position to a third position in response to force applied to the latch by a user and configured to translate from the third position to the second position in response to withdrawal of force by the user to the latch.
3. The multi-stage latch assembly of claim 2, further comprising an indicator other than the latch itself configured to provide a user-visible indication that the latch has been translated from the second position.
4. The multi-stage latch assembly of claim 3, wherein the user-visible indication other than the latch itself comprises a user-visible indication other than mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
5. The multi-stage latch assembly of claim 1, wherein the latch is substantially flush with a surface of the structural element in the first position and is substantially non-flush with the surface in the second position such that the latch in the second position is more accessible to a user than the latch in the first position.
6. The multi-stage latch assembly of claim 1, wherein the structural element is a drawer configured to carry one or more information handling resources.
7. The multi-stage latch assembly of claim 1, wherein the user-visible indication other than the lock itself comprises a user-visible indication other than mechanical components for translating the lock, mechanical components for maintaining the lock in the locked state, mechanical components for maintaining the lock in the unlocked state, mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
8. A chassis drawer configured to carry one or more modular information handling resources, the chassis drawer comprising:
one or more structural elements for carrying the one or more modular information handling systems and configured such that the chassis drawer may translate between an open position and a closed position relative to a chassis while the chassis drawer is disposed in the chassis; and
a multi-stage latch assembly coupled to at least one of the one or more structural elements, the multi-stage latch assembly comprising:
a lock configured to toggle between a locked state and an unlocked state;
a latch configured to translate between a first position and a second position such that the latch is in the first position when the lock is in the locked state and the latch is in the second position when the lock is in the unlocked state; and
an indicator other than the lock itself or a portion thereof and other than the latch itself or a portion thereof configured to provide a user-visible indication that the lock is in the unlocked state.
9. The chassis drawer of claim 8, wherein the latch is configured to translate from the second position to a third position in response to force applied to the latch by a user and configured to translate from the third position to the second position in response to withdrawal of force by the user to the latch.
10. The chassis drawer of claim 9, the multi-stage latch assembly further comprising an indicator other than the latch itself configured to provide a user-visible indication that the latch has been translated from the second position.
11. The chassis drawer of claim 10, wherein the user-visible indication other than the latch itself comprises a user-visible indication other than mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
12. The chassis drawer of claim 8, wherein the latch is substantially flush with a surface of the chassis drawer in the first position and is substantially non-flush with the surface in the second position such that the latch in the second position is more accessible to a user than the latch in the first position.
13. The chassis drawer of claim 8, wherein the user-visible indication other than the lock itself comprises a user-visible indication other than mechanical components for translating the lock, mechanical components for maintaining the lock in the locked state, mechanical components for maintaining the lock in the unlocked state, mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
14. A method comprising:
toggling a lock of a multi-stage latch assembly for facilitating removal of a structural element from a chassis between a locked state and an unlocked state responsive to user interaction with the lock;
translating a latch between a first position and a second position such that the latch is in the first position when the lock is in the locked state and the latch is in the second position when the lock is in the unlocked state; and
displaying a user-visible indication other than the latch itself or a portion thereof and other than the lock itself or a portion thereof that that the latch has been translated from the second position.
15. The method of claim 14, further comprising, translating the latch from the second position to a third position in response to force applied to the latch by the a and configured to translate from the third position to the second position in response to withdrawal of force by the user to the latch.
16. The method of claim 15, further comprising displaying a user-visible indication other than the latch itself that the latch has been translated from the second position.
17. The method of claim 14, wherein the latch is substantially flush with a surface of the structural element in the first position and is substantially non-flush with the surface in the second position such that the latch in the second position is more accessible to a user than the latch in the first position.
18. The method of claim 14, further comprising displaying a user-visible indication other than the lock itself that the lock is in the unlocked state responsive to the lock toggling from the locked state to the unlocked state.
19. The method of claim 18, wherein the user-visible indication other than the lock itself comprises a user-visible indication other than mechanical components for translating the lock, mechanical components for maintaining the lock in the locked state, mechanical components for maintaining the lock in the unlocked state, mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
20. The method of claim 14, wherein the structural element is a drawer configured to carry one or more information handling resources.
21. The method of claim 14, wherein the user-visible indication other than the latch itself comprises a user-visible indication other than mechanical components for translating the latch, mechanical components for maintaining the latch in the first position, and mechanical components for maintaining the latch in the second position.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A downhole tool, comprising:
a tubular housing;
a piston disposed within said tubular housing;
a flow tube disposed at said piston; and
a bi-directional flapper mechanism disposed in cooperable communication with said flow tube.
2. The downhole tool as claimed in claim 1, further comprising a spring disposed at said flow tube, said spring being configured to be compressed upon biasing said flow tube in a downhole direction.
3. The downhole tool of claim 2, wherein a downhole facing surface of said bi-directional flapper mechanism is engagable by a lower seat and base assembly.
4. The downhole tool as claimed in claim 1, further comprising a lock ring engagable with an uphole facing surface of said bi-directional flapper mechanism, said lock ring being configured to support pressure exerted on said bi-directional flapper mechanism from a downhole direction.
5. The downhole tool as claimed in claim 4 further comprising a set of teeth engagable by said lock ring, the engagement of said lock ring and said teeth providing the support of the pressure exerted on said bi-directional flapper mechanism from the downhole direction.
6. The downhole tool as claimed in claim 5, further comprising a ratcheting mechanism configured to disengage said lock ring from said teeth.
7. The downhole tool as claimed in claim 6 wherein said ratcheting mechanism comprises:
a piston, said piston being actuatable upon a pressurization;
a spring configured to be biased by said piston;
a pin disposed in operable communication with said spring; and
a profiled slot engagable by said pin.
8. The downhole tool as claimed in claim 5 wherein said teeth are a one way thread.
9. The downhole tool as claimed in claim 5 wherein said teeth are wicker threads.
10. The downhole tool as claimed in claim 1 wherein said bi-directional flapper mechanism is configured to be disengagable by a shifting tool insertable into said downhole tool.
11. A bi-directional barrier device for a downhole tool positionable in a wellbore, said barrier comprising:
a flapper mechanism configured to provide a seal between opposing uphole- and downhole ends of said downhole tool upon actuation of said flapper mechanism, said flapper mechanism comprising,
a first flapper, and
a second flapper articulably linked to said first flapper, said second flapper further being articulably linked to a base member, said base member being movable within said downhole tool.
12. The bi-directional barrier device as claimed in claim 11, wherein said flapper mechanism further comprises a locking device configured to support pressure exerted on said flapper mechanism from a first direction, and wherein said flapper mechanism further comprises a surface to support pressure exerted on said flapper mechanism from a second direction.
13. The barrier device as claimed in claim 12, wherein said locking device comprises a dog supported on a mandrel, said dog being configured to maintain said locking device in a locked configuration.
14. A method of controlling a flow of production fluids in a wellbore, the method comprising:
closing a barrier device across a tubing string of said wellbore;
supporting said barrier device from a first direction; and
supporting said barrier device from a second direction.
15. A method of controlling a flow or production fluids in a wellbore as claimed in claim 14 wherein said closing of said barrier device comprises:
removing a support member from said barrier device, and
collapsing an articulably linked upper flapperlower flapper arrangement at said barrier device such that said wellbore is blocked by said articulably linked upper flapperlower flapper arrangement.
16. A method of controlling a flow or production fluids in a wellbore as claimed in claim 14 wherein said supporting of said barrier device from the pressure exerted on said barrier device from the first direction comprises shifting a support to a position to prevent opening of the barrier device.
17. A method of controlling a flow or production fluids in a wellbore as claimed in claim 16 wherein said shifting said support comprises depressurizing a chamber at a downhole side of said barrier device.
18. A method of controlling a flow or production fluids in a wellbore as claimed in claim 16 wherein said shifting comprises mechanically shifting said support.
19. A method of controlling a flow or production fluids in a wellbore as claimed in claim 16 wherein said shifting comprises electrically shifting said support.
20. A method of controlling a flow or production fluids in a wellbore as claimed in claim 16 wherein said shifting comprises hydraulically shifting said support.
21. A method of controlling a flow or production fluids in a wellbore as claimed in claim 16 wherein said setting down weight on a line at which said barrier device is located.
22. A method of controlling a flow or production fluids in a wellbore as claimed in claim 14 wherein said supporting of said barrier device from the pressure exerted on said barrier device from the second direction comprises:
pressurizing said tubing string uphole from said barrier device,
biasing a lock ring in a downhole direction to close said barrier device, and
engaging said lock mechanism with a set of wicker threads.
23. A method of controlling a flow or production fluids in a wellbore as claimed in claim 14 further comprising opening said barrier device.
24. A method of controlling a flow or production fluids in a wellbore as claimed in claim 23 wherein said opening comprises unsupporting said barrier device.
25. A method of controlling a flow or production fluids in a wellbore as claimed in claim 24 wherein said unsupporting is unsupporting said barrier device from said pressure exerted from said first direction and from said second direction.
26. A method of controlling a flow or production fluids in a wellbore as claimed in claim 24 wherein said unsupporting is by shifting one or more supports.
27. A method of controlling a flow or production fluids in a wellbore as claimed in claim 23 wherein said opening of said barrier device comprises:
applying a pressure to said tubing string uphole from said barrier device,
compressing a spring to cause a pin to translate through a milled profile in a downhole direction;
bleeding off the pressure in said tubing string to allow said pin to translate in an uphole direction; and
un-supporting said barrier device from the pressure exerted on said barrier device from the second direction.
28. A fluid control device comprising:
a housing;
a double flapper disposed at said housing; and
a support engageable to support said double flapper.
29. A fluid control device as claimed in claim 28 wherein said support is a seat and supports said double flapper in a closed position.
30. A fluid control device as claimed in claim 28 wherein said support is of a plurality of components to support said double flapper against pressure exerted on said double flapper from uphole of said double flapper and from downhole of said double flapper.
31. A double flapper for a fluid control device comprising:
a first flapper; and
a second flapper articulatively coupled to said first flapper.